Commentaries to literary works remain one of the most important and telling aspects of the Tamil literary tradition. Commentaries to ancient Tamil works have been written since the medieval period and continue to be written in the modern era. Many ancient Tamil works continue to remain in comprehension chiefly due to exegesis or commentaries written on them. The most famous examples of such works are the Tolkappiyam and the Tirukkural, with the latter remaining the most reviewed work in the Tamil literature.